Sell Your Smart Contract Development Services Online
Sell contract engineering the way it is actually bought — a deployment, an audit, an upgrade path. Zinn Hub gives you three ways to sell in one platform: fixed-price Zinns, Project bidding with free proposals, and a Freelancer Directory profile buyers can hire from directly. You keep 100% of your first $500, and buyers can pay in 200+ cryptocurrencies.
Already selling smart contract work elsewhere? Import it in minutes — free.
Paste one listing, or your whole public profile, into Import My Services in your Zinner dashboard. It rebuilds your title, description, packages and FAQs as ready-to-review Zinns, carries across up to 10 of your reviews word for word, and generates free images. You preview and confirm every Zinn before anything is submitted, and a whole profile can produce up to three complete Zinns at once.
Three Ways to Sell Smart Contract Development
Most freelance platforms give you one workflow. Zinn Hub gives you three — use one, two, or all three. Each one draws on the same contract engineering skills.
Productise the work you already repeat — an ERC-20 with tax logic, an ERC-721 mint with allowlist, a vesting or staking contract, a gas-optimisation pass. Buyers purchase at checkout, and with your own PayPal or Stripe connected the payment lands with you there and then. Scope defined once, sold many times.
Bid on posted contract briefs with free proposals — no credits, no paid bids. A public Freelancer profile lets protocol teams hire you directly for the work that never gets posted publicly: upgrade migrations, incident response, second-opinion reviews.
Offer bite-size contract tasks at $5, $10, $15 or $20 — a testnet deploy, a verify-on-explorer job, a single-function gas review, a quick read-through before a buyer commits to a full audit. The fastest route to a review history in a trust-driven niche.
One contract skill set. Three earning paths.
Smart Contract Services You Can Sell & Earn From
Every specialism below can be sold as a Zinn, offered as a Micro Zinn, bid on through Projects, or showcased on your Freelancer Directory profile. Pick your niche and earn from all of them.
Token & NFT Contracts
ERC-20, ERC-721 and ERC-1155 contracts with mint, burn, allowlist, royalty and reveal mechanics
Contract Auditing & Security
Manual review, static analysis, fuzzing and invariant testing, with a written findings report and fixes
DeFi Contract Engineering
AMMs, lending markets, yield vaults, staking and reward distribution, oracle and bridge integration
Token Launch Contracts
Presale and vesting logic, liquidity locking, timelocks, multisig treasury setup and launch support
Contract Integration & dApps
Wiring contracts to a front end — ethers.js, wagmi, wallet connect, event indexing and subgraphs
NFT Minting Infrastructure
Metadata and IPFS pipelines, signature minting, reveal scheduling and marketplace compatibility
Tokenomics & Governance
Supply and emission modelling, incentive design, DAO voting modules and treasury structure
Architecture & Due Diligence
Chain selection, upgradeability patterns, proxy design reviews and technical due diligence
Contract-Facing UX
Transaction flows, signing prompts, error states and dashboards designed around on-chain behaviour
Why Sell Smart Contract Development on Zinn Hub?
Built for contract engineers who want repeat, productised work as well as bespoke briefs.
Three Ways to Sell
Not just gigs. List Blockchain Development Zinns, bid on Smart Contract Projects with free proposals, get hired from the Freelancer Directory, and offer Smart Contract Audit Micro Zinns from $5. Several income streams, one account.
0% on Your First $500
0% commission on your first $500, then tiered rates that fall as you sell — as low as 7% on Agency Zinner. See the full pricing page for every tier and both membership rates.
Get Paid Your Way
Connect your own PayPal or Stripe account and buyers pay you directly at checkout — no waiting for a payout run. Prefer the platform to hold the payment until the order completes? Choose platform-protected payments instead.
Buyers Can Pay in Crypto
Every listing accepts cards, PayPal, Apple Pay, Google Pay, bank transfer or 200+ cryptocurrencies including Bitcoin, Ethereum and USDT — the way most protocol treasuries already pay. No wallet setup needed from you.
Two-Way Custom Offers
Send a custom offer with your own scope, or receive a request from a buyer. One-time or subscription pricing — ideal for a fixed-scope audit today and a monitoring retainer afterwards.
Full Payouts Dashboard
Track every transaction, commission breakdown and payout in real time, and export to CSV. View your payouts dashboard.
Subscription Services
Sell recurring work on daily, weekly, monthly or yearly billing — contract monitoring, upgrade support, quarterly re-audits. Hourly-rate services and video consultations are supported too.
Your Brand, Your Storefront
Your logo, your banner, your published audit reports and verified contract addresses. Build a branded storefront buyers remember, with unrestricted communication with clients.
Buyers in 45 Languages
Zinn Hub is available in 45 languages, and buyers can message you in 12 more. Prices are shown in USD, with an approximate equivalent in 59 display currencies.
Free Setup Help
Three guided wizards — Store Setup, Payment Setup and Zinn Creation — build your profile, publish your first listings and configure how you get paid, in about 15 minutes and completely free. Import My Services rebuilds your existing listings if you already sell elsewhere.
Every Zinn Hub seller gets an intelligence profile on the buyer in front of them — trust score, order history, spending pattern, rejection behaviour, refund rate, and the exact requirements they submitted on past orders. On audit work, where the brief is often a single repository link, that history tells you how the last three engineers were treated before you quote.
Keep private notes for yourself, or share public notes with other Zinners so the whole marketplace prices risk more accurately.
Learn About Buyer Insights →How to Start Selling Smart Contract Development
Three guided wizards get you selling in about 15 minutes. There are no upfront costs.
Store Setup Wizard
Sign up free at our registration page. The Store Setup Wizard builds your branded storefront — logo, banner, bio, certifications and case studies.
Payment Setup Wizard
Connect your own Stripe and PayPal so buyers pay you directly at checkout, or configure platform-protected payments where Zinn Hub holds the payment until the order completes.
Zinn Creation Wizard
Build your first contract listing with packages, pricing and delivery times — or a Smart Contract Audit Micro Zinn from $5. Then switch on Projects bidding and your directory profile.
What Does Freelance Smart Contract Work Pay?
Typical market ranges for the kind of scope buyers usually brief. These are wider-market figures, not Zinn Hub earnings.
Rates vary widely by chain, contract complexity, test coverage expectations and experience, and a quoted range is never a guarantee. You set your own prices on Zinn Hub, always in USD, and you decide what each package includes.
Who Can Sell Smart Contract Development Here?
Zinners are verified with government-issued photo ID and evidence of their skills and past work — beyond that, the door is open.
Solidity & Rust Engineers
Contract developers who want a steadier pipeline than word of mouth, and a bigger share of each invoice than an agency margin leaves them.
Audit Firms & Web3 Studios
Small teams adding a marketplace channel. List team capabilities, run several reviews at once, and sell monitoring as a subscription.
Backend Devs Learning Solidity
Already strong in TypeScript, Go or Rust? Start with Micro Zinns at $5 to $20 on deployment and verification tasks, then move up to full builds.
What You Get as a Zinn Hub Smart Contract Seller
Everything below is how the platform works today.
| Feature | Zinn Hub |
|---|---|
| Ways to sell | Three — Zinns, Projects and a Freelancer Directory profile |
| Commission | 0% on your first $500, then tiered rates that fall as you sell — as low as 7% on Agency Zinner |
| Buyer platform fee | None — the price a buyer sees is the price they pay |
| Cost to bid on a project | Free proposals — no credits to buy |
| Getting paid | Connect your own PayPal or Stripe and buyers pay you directly at checkout |
| Starter listings | Micro Zinns at $5, $10, $15 or $20 |
| Buyer payment methods | Cards, PayPal, Apple Pay, Google Pay, bank transfer and 200+ cryptocurrencies |
| Currency | All prices in USD, with an approximate equivalent in 59 display currencies |
| Reach | 45 site languages, plus 12 more you can be messaged in |
| Seller verification | Government-issued photo ID and evidence of skills and past work |
| Refunds | Credited to the buyer’s Zinn Wallet in full, in USD |
| Posting a project | Free for buyers — they pay only when they accept a proposal |
Full tier thresholds and membership rates are on the pricing page.
Frequently Asked Questions
Anything with a repeatable scope: a standard ERC-20 or ERC-721 deployment, a staking or vesting module, an explorer verification, a gas-optimisation pass, or a fixed-depth security review. Bespoke protocol work usually arrives through Projects or through your Freelancer Directory profile instead, where you can quote against the brief.
0% commission on your first $500, then tiered rates that fall as you sell — as low as 7% on Agency Zinner. Buyers pay no platform fee on top, so your listed price is what they are charged. Every tier threshold and both membership rates are published on the pricing page.
Two modes, chosen by you. Connect your own PayPal or Stripe account and buyers pay you directly at checkout, with no payout run to wait for. Or use platform-protected payments, where Zinn Hub holds the payment until the order completes and pays you from the payout queue afterwards. Both are itemised in your payouts dashboard.
Yes, and many Zinners sell both. A fixed-depth review works well as a packaged Zinn, a quick read-through works as a Micro Zinn from $5, and a full multi-contract engagement is better bid through Projects. You can then sell re-audits and monitoring as a subscription on monthly or quarterly billing.
Zinn Hub does not restrict the stack. Sellers list Solidity for Ethereum and EVM chains, Rust for Solana and Substrate, Move for Aptos and Sui, and Vyper — alongside tooling such as Foundry, Hardhat, Anchor and Slither. Add the ones you work in as skills on your Freelancer profile so buyers filtering by skill can find you.
Buyers can pay with cards, PayPal, Apple Pay, Google Pay, bank transfer or 200+ cryptocurrencies including Bitcoin, Ethereum and USDT. You do not need a wallet to accept those payments — the checkout handles it. All prices are stored and charged in USD, with an approximate equivalent shown in any of 59 display currencies.
Import My Services in your Zinner dashboard rebuilds a pasted listing into a ready-to-review Zinn — title, description, packages, FAQs — and can turn a whole pasted profile into up to three complete Zinns. Up to 10 of your reviews come across word for word and images are generated free. You get 10 free imports and you confirm every Zinn before it is submitted.
Check the buyer first. Buyer Insights shows their order history, spending pattern, refund rate, rejection behaviour and the exact requirements they submitted on past orders, so you can price the risk before you quote. Refunds on Zinn Hub go to the buyer’s Zinn Wallet in full, in USD, and a small Micro Zinn is a low-cost way to test a new working relationship.
Start Selling Your Smart Contract Development Services
Three ways to sell — Zinns, Projects with a Freelancer profile, and Micro Zinns at $5, $10, $15 or $20. 0% commission on your first $500, then tiered rates that fall as you sell — as low as 7% on Agency Zinner. Connect your own PayPal or Stripe and buyers pay you directly at checkout. Three wizards get you selling in about 15 minutes.
Explore More Services to Sell
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